单项选择题

--Why do you go to work on foot ______ That doesn't seem to save your time.
--To get more exercise and keep healthy.

A．all the time
B．at times
C．from time to time
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单项选择题
There are so many kinds of radios in the shop. I can't decide ______.
A．to buy what
B．to buy which
C．which to buy
单项选择题
He ______ but ______ nothing.
A．heard; listened
B．listened; heard
C．listened to; heard
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